Condec UPS3210 - Manual (Page 27)

Calibration and Adjustment Procedure 23
3.5 Shunt Resistor Calibration
Press the STEPPER push-button again to select the SHUNT RESISTOR CALIBRATION mode. The display will be as
shown in Figure 3-5.
Figure 3-5. Shunt Resistor Calibration
With the UPS3000/UPS3110/UPS3210’s highest pressure range selected, perform the four step sequence
described below:
1. Be sure the input pressure to the UPS3000/UPS3110/UPS3210 is at zero psig.
NOTE: For Absolute Only Unit, vacuum pump with PSIA indicator must be used to obtain zero reading.
2. Press and hold the ZERO push-button switch on the front panel until a stable zero indication is obtained.
3. Release the ZERO push-button switch and allow the display to stabilize at its shunt resistor calibration
number, (100 ± 5.00%).
4. Press the ENTER push-button switch, as shown in Figure 3-2 on page 20, on the front panel. If accepted,
the bottom half of all display digits will momentarily illuminate.
3.6 Permanent Data Storage
After completing the above calibration procedures, the new data that has been entered into the computer must
be permanently stored. The sequence to do this is as follows:
1. Pressing the STEPPER push-button again, as shown in Figure 3-2 on page 20, will bring the indicator
back to its initial Data Recall display condition as shown in Figure 3-2.
2. Open the instrument and depress the DATA ENTER switch, S2, located approximately in the middle of the
circuit board.
NOTE: See “Case Removal and Installation” on page 28 and for "DATA ENTER" switch location see Figure 2-7 on
page 8.
3. If the data is accepted, the three-digit number on the right side of the display will indicate 1 377 for as
long as the DATA ENTER switch, S2, is depressed.
4. The calibration is now complete and CALIBRATE/OPERATE switch, S3, must be returned to its normal
operating positions as shown in Table 3-1 on page 20. The pressure standard may now be disconnected.
3.7 Barometric Offset - Absolute/Gage Switch Selectable Units ONLY
NOTES: This section is only required if barometric conditions are higher or lower than 14.7 PSIA.
See“Case Removal and Installation” on page 28. See Figure 2-7 on page 8 for S3, CALIBRATE/OPERATE
configuration switch and S2 "DATA ENTER" switch location. See Figure 3-2 on page 20 for STEPPER and ENTER
push-button switch locations.
If required, obtain the current barometric pressure from a pressure standard with an accuracy of.025% or better,
to calibrate the absolute zero at the current barometric pressure. Remove top cover and
CALIBRATE/OPERATE
switch, S3, must be changed to its calibrate positions as shown in Table 3-1 on page 20. Using the STEPPER
push-button place the unit into ZERO/SPAN calibration mode as shown in Figure 3-3 on page 21.